Do not reset CFLAGS when configuring software for target

configure for target software has been invoked `./configure
CFLAGS=$CFLAGS_FOR_TARGET`, however if CFLAGS_FOR_TARGET is empty, then that
cause reset CFLAGS to be empty as well, therefore default CFLAGS of package
will be never used, which often leads to software compiled without
optimizations and debug symbols.

Signed-off-by: Anton Kolesov <[email protected]>

Author: anthony-kolesov

arc-init.sh

@@ -460,6 +460,14 @@ configure_for_arc() {
 
     local srcdir=$1
     local triplet=$2
+
+    # Cannto do a simple "CFLAGS=$CFLAGS_FOR_TARGET, because if latter is empty
+    # that would reset CFLAGS unnecessarily.
+    local cflags=
+    if [ "$CFLAGS_FOR_TARGET" ]
+    then
+	cflags="CFLAGS=$CFLAGS_FOR_TARGET"
+    fi
     shift 2
 
     # --prefix must correspond to prefix on *target* system, not where it will
@@ -471,7 +479,7 @@ configure_for_arc() {
     if ! $srcdir/configure --prefix=/usr --host=$triplet \
 	    --with-pkgversion="$UCLIBC_TOOLS_VERSION"\
 	    --with-bugurl="$ARC_COMMON_BUGURL" \
-	    CFLAGS="$CFLAGS_FOR_TARGET" $* \
+	    $cflags $* \
 	    >> "$logfile" 2>&1
     then
 	echo "ERROR: failed while configuring."